Posted by christopher on Monday, January 9, 2012 at 6:00pm.
what is the sum the measures of an octagon.

geometry  Damon, Monday, January 9, 2012 at 6:08pm
Your question makes no sense but I will guess you want the interior angles.
The sum of all the exterior angles all the way around anything is 360 degrees.
so with an octagon, each exterior angle is 360/8 = 45 degrees
but the sum of the interior angle and the exterior angle is a straight line, 180
so each interior angle = 180 45 = 135 degrees
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